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Significant Accounting Policies - Percentage of Net Service Revenue Earned by Type of Ownership or Relationship with Operating Entity (Detail)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Health Care Organization, Revenue [Abstract]    
Percentage of net service revenue 100.00%lhcg_RevenueByOwnershipType 100.00%lhcg_RevenueByOwnershipType
Wholly-owned subsidiaries    
Health Care Organization, Revenue [Abstract]    
Percentage of net service revenue 54.60%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 49.20%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Equity joint ventures    
Health Care Organization, Revenue [Abstract]    
Percentage of net service revenue 43.20%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_EquityJointVenturesMember		 48.00%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_EquityJointVenturesMember
License leasing arrangements    
Health Care Organization, Revenue [Abstract]    
Percentage of net service revenue 1.30%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_LicenseLeasingArrangementsMember		 1.90%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_LicenseLeasingArrangementsMember
Management services    
Health Care Organization, Revenue [Abstract]    
Percentage of net service revenue 0.90%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_ManagementServicesMember		 0.90%lhcg_RevenueByOwnershipType
/ dei_LegalEntityAxis
= lhcg_ManagementServicesMember